Sm0.5Sr0.5CoO3-δsurface modification of La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.12-δComposite Oxygen Electrodes for Solid Oxide Electrochemical Cells

Matthew Y. Lu; Tianrang Yang; Roberto Scipioni; Yvonne A. Chart; Alexander Furlong; Scott A. Barnett

doi:10.1149/1945-7111/abca6f

Sm_0.5Sr_0.5CoO_3-δsurface modification of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ-Ce_0.9Gd0.1_2-δComposite Oxygen Electrodes for Solid Oxide Electrochemical Cells

Matthew Y. Lu, Tianrang Yang, Roberto Scipioni, Yvonne A. Chart, Alexander Furlong, Scott A. Barnett

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O2-δ (LSCF-GDC) composite oxygen electrodes have been widely used in intermediate temperature (<700 °C) solid oxide cells, with composite usually providing better electrochemical performance than single-phase LSCF. However, LSCF-based electrodes are often observed to degrade over time due to Sr segregation. Here we present an impedance spectroscopy study comparing the degradation behaviors of LSCF-GDC and Sm0.5Sr0.5CoO3-δ (SSC) infiltrated LSCF-GDC electrodes. The LSCF-GDC polarization resistance increases by ∼5 times over ∼1000 h at 650 °C. In contrast, the SSC-infiltrated electrode shows similar initial polarization resistance but much more stable performance. The impedance modeling results show that the improved stability is associated with the low frequency oxygen dissociative adsorption/desorption process. The results suggest that this adsorption/desorption process slows due to increased Sr segregation on LSCF over time, and that SSC does not degrade significantly due to Sr surface segregation.

Original language	English (US)
Article number	164504
Journal	Journal of the Electrochemical Society
Volume	167
Issue number	16
DOIs	https://doi.org/10.1149/1945-7111/abca6f
State	Published - Dec 2020

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Materials Chemistry
Surfaces, Coatings and Films
Electrochemistry
Renewable Energy, Sustainability and the Environment

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1149/1945-7111/abca6f

Cite this

@article{1068ce1894034a8f85d4d687244c71c9,

title = "Sm0.5Sr0.5CoO3-δsurface modification of La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.12-δComposite Oxygen Electrodes for Solid Oxide Electrochemical Cells",

abstract = "La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O2-δ (LSCF-GDC) composite oxygen electrodes have been widely used in intermediate temperature (<700 °C) solid oxide cells, with composite usually providing better electrochemical performance than single-phase LSCF. However, LSCF-based electrodes are often observed to degrade over time due to Sr segregation. Here we present an impedance spectroscopy study comparing the degradation behaviors of LSCF-GDC and Sm0.5Sr0.5CoO3-δ (SSC) infiltrated LSCF-GDC electrodes. The LSCF-GDC polarization resistance increases by ∼5 times over ∼1000 h at 650 °C. In contrast, the SSC-infiltrated electrode shows similar initial polarization resistance but much more stable performance. The impedance modeling results show that the improved stability is associated with the low frequency oxygen dissociative adsorption/desorption process. The results suggest that this adsorption/desorption process slows due to increased Sr segregation on LSCF over time, and that SSC does not degrade significantly due to Sr surface segregation.",

author = "Lu, {Matthew Y.} and Tianrang Yang and Roberto Scipioni and Chart, {Yvonne A.} and Alexander Furlong and Barnett, {Scott A.}",

note = "Publisher Copyright: {\textcopyright} 2020 The Electrochemical Society ({"}ECS{"}). Published on behalf of ECS by IOP Publishing Limited.",

year = "2020",

month = dec,

doi = "10.1149/1945-7111/abca6f",

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T1 - Sm0.5Sr0.5CoO3-δsurface modification of La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.12-δComposite Oxygen Electrodes for Solid Oxide Electrochemical Cells

AU - Lu, Matthew Y.

AU - Yang, Tianrang

AU - Scipioni, Roberto

AU - Chart, Yvonne A.

AU - Furlong, Alexander

AU - Barnett, Scott A.

PY - 2020/12

Y1 - 2020/12

N2 - La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O2-δ (LSCF-GDC) composite oxygen electrodes have been widely used in intermediate temperature (<700 °C) solid oxide cells, with composite usually providing better electrochemical performance than single-phase LSCF. However, LSCF-based electrodes are often observed to degrade over time due to Sr segregation. Here we present an impedance spectroscopy study comparing the degradation behaviors of LSCF-GDC and Sm0.5Sr0.5CoO3-δ (SSC) infiltrated LSCF-GDC electrodes. The LSCF-GDC polarization resistance increases by ∼5 times over ∼1000 h at 650 °C. In contrast, the SSC-infiltrated electrode shows similar initial polarization resistance but much more stable performance. The impedance modeling results show that the improved stability is associated with the low frequency oxygen dissociative adsorption/desorption process. The results suggest that this adsorption/desorption process slows due to increased Sr segregation on LSCF over time, and that SSC does not degrade significantly due to Sr surface segregation.

AB - La0.6Sr0.4Co0.2Fe0.8O3-δ-Ce0.9Gd0.1O2-δ (LSCF-GDC) composite oxygen electrodes have been widely used in intermediate temperature (<700 °C) solid oxide cells, with composite usually providing better electrochemical performance than single-phase LSCF. However, LSCF-based electrodes are often observed to degrade over time due to Sr segregation. Here we present an impedance spectroscopy study comparing the degradation behaviors of LSCF-GDC and Sm0.5Sr0.5CoO3-δ (SSC) infiltrated LSCF-GDC electrodes. The LSCF-GDC polarization resistance increases by ∼5 times over ∼1000 h at 650 °C. In contrast, the SSC-infiltrated electrode shows similar initial polarization resistance but much more stable performance. The impedance modeling results show that the improved stability is associated with the low frequency oxygen dissociative adsorption/desorption process. The results suggest that this adsorption/desorption process slows due to increased Sr segregation on LSCF over time, and that SSC does not degrade significantly due to Sr surface segregation.

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